1 /* 2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2014, Red Hat Inc. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 #include "precompiled.hpp" 27 #include "asm/macroAssembler.hpp" 28 #include "asm/macroAssembler.inline.hpp" 29 #include "code/icBuffer.hpp" 30 #include "gc/shared/collectedHeap.inline.hpp" 31 #include "interpreter/bytecodes.hpp" 32 #include "memory/resourceArea.hpp" 33 #include "nativeInst_aarch64.hpp" 34 #include "oops/oop.inline.hpp" 35 36 int InlineCacheBuffer::ic_stub_code_size() { 37 // Total size of: ldr, (adrp, add, br | b), int64. 38 return (MacroAssembler::far_branches() ? 6 : 4) * NativeInstruction::instruction_size; 39 } 40 41 #define __ masm-> 42 43 void InlineCacheBuffer::assemble_ic_buffer_code(address code_begin, void* cached_value, address entry_point) { 44 ResourceMark rm; 45 CodeBuffer code(code_begin, ic_stub_code_size()); 46 MacroAssembler* masm = new MacroAssembler(&code); 47 // note: even though the code contains an embedded value, we do not need reloc info 48 // because 49 // (1) the value is old (i.e., doesn't matter for scavenges) 50 // (2) these ICStubs are removed *before* a GC happens, so the roots disappear 51 // assert(cached_value == NULL || cached_oop->is_perm(), "must be perm oop"); 52 53 address start = __ pc(); 54 Label l; 55 __ ldr(rscratch2, l); 56 __ far_jump(ExternalAddress(entry_point)); 57 __ align(wordSize); 58 __ bind(l); 59 __ emit_int64((int64_t)cached_value); 60 // Only need to invalidate the 1st two instructions - not the whole ic stub 61 ICache::invalidate_range(code_begin, InlineCacheBuffer::ic_stub_code_size()); 62 assert(__ pc() - start == ic_stub_code_size(), "must be"); 63 } 64 65 address InlineCacheBuffer::ic_buffer_entry_point(address code_begin) { 66 NativeMovConstReg* move = nativeMovConstReg_at(code_begin); // creation also verifies the object 67 NativeJump* jump = nativeJump_at(code_begin + 4); 68 return jump->jump_destination(); 69 } 70 71 72 void* InlineCacheBuffer::ic_buffer_cached_value(address code_begin) { 73 // The word containing the cached value is at the end of this IC buffer 74 uintptr_t *p = (uintptr_t *)(code_begin + ic_stub_code_size() - wordSize); 75 void* o = (void*)*p; 76 return o; 77 }